Quoting Swiftski (Thread starter):I was wondering if "one-way" trips like mine are popular, and if so, whether demand tends to be higher in Business/Premium/Equivalent for daylight, or night flights?

Premium cabins are always deployed on night-flights as pax are much more willing to pay extra for being able to sleep.
For most people it's the complete opposite of your preferences; they are willing to watch PTV in Y during the day and pay to get a decent sleep in C or F at night.
Most people sleep better in a flat than in a sitting position, and Premium cabins allow for much more flexibility in meal/breakfast times, etc.

The main purpose of the new generation of F/C is to relax and sleep. Therefore if i have to make a choice between day/ night flights in C i would choose night. Get on the plane, take off, put the seat in flat, and sleep...

It is an interesting question though, maybe even more specifically for F class. At night, you have the great sleeping capabilities but you skip on all the perks and great food. Obviously, these are designed to get you to pay the rediculouly high fare which is in place becasue of the amount of space the F seat takes up compared to Y seats so in terms of pricing/advertising, the seat and therefore sleep is a lot more important. However, for me, I'd much prefer to get all the service.